Dr. House: Words have set meanings for a reason. If you see an animal like Bill and you try to play fetch, Bill’s going to eat you, because Bill’s a bear.
Little Girl: Bill has fur, four legs, and a collar. He’s a dog.
Dr. House: You see, that’s what’s called a faulty syllogism; just because you call Bill a dog doesn’t mean that he is … a dog.
“
| — | House, M.D. ep 3x10, ”Merry Little Christmas” |